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The influence of the reactant size on the micropyretic synthesis of NiAl intermetallic compounds

Published online by Cambridge University Press:  03 March 2011

H.P. Li  and
J.A. Sekhar
H.P. Li*
Affiliation:
International Center for Micropyretics, Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
J.A. Sekhar
Affiliation:
International Center for Micropyretics, Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
*
a)Present address: Jin-Wen College of Technology & Business, Hsinten, Taiwan.
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Abstract

The effect of the nickel (Ni) and aluminum (Al) reactant particle size on the micropyretic synthesis of NiAl is studied in this article. A change in the low melting component (Al particle) size is noted to have a limited influence on the micropyretic synthesis conditions. However, a change in the high melting component (Ni particle) size not only influences the combustion temperature and propagation velocity, but also affects the final porosity and grain size of the synthesized products. The combustion mode is also noted to change from stable to unstable when the Ni particle size is increased. It is noted that a diffusion-type control mechanism is dominant for the rapid reaction sequence in the NiAl system. An atomistic mechanism of the Ni-Al micropyretic reaction is also proposed in this article. Following this model, analytical expressions are developed to relatc the variation of the Ni size to the NiAl formation rate with the imposed processing conditions during the micropyretic synthesis. The mechanism of the final grain formation and the grain size changes with changes in the processing variables is also discussed.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2471 - 2480
Copyright
Copyright © Materials Research Society 1995

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